/*
 * Copyright 2002-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package sf.database.datasource.lookup;

import sf.database.datasource.DataSourceLookup;
import sf.spring.util.Assert;

import javax.sql.DataSource;
import java.util.Collection;
import java.util.Collections;

/**
 * An implementation of the DataSourceLookup that simply wraps a
 * single given DataSource, returned for any data source name.
 * @author Juergen Hoeller
 * @since 2.0
 */
public class SingleDataSourceLookup implements DataSourceLookup {

    private final DataSource dataSource;


    /**
     * Create a new instance of the {@link SingleDataSourceLookup} class.
     * @param dataSource the single {@link DataSource} to wrap
     */
    public SingleDataSourceLookup(DataSource dataSource) {
        Assert.notNull(dataSource, "DataSource must not be null");
        this.dataSource = dataSource;
    }


    @Override
    public DataSource getDataSource(String dataSourceName) {
        return this.dataSource;
    }

    @Override
    public Collection<String> getAvailableKeys() {
        return Collections.singletonList("Single");
    }
}
